It was such a ______ to have spent a day with the local family.
| A．privilege | B．concept | C．qualification | D．requirement |
We have done things we ought not to have done and ________ undone things we ought to have done.
| A．left | B．leave |
| C．will leave | D．leaving |
The two ladies are ________ the same age, but there seems to be ten years ________ them.
| A．at, between | B．about, among |
| C．as, among | D．of, between |
The train ________ arrive at 11∶30, but was an hour late.
| A．was about to | B．was likely to |
| C．was supposed to | D．was certain to |
While building a tunnel through the mountain, ________ .
| A．an underground lake was discovered |
| B．there was an underground lake discovered |
| C．a lake was discovered underground |
| D．the workers discovered an underground lake |
I planned ________ to see you last week, but I was ill.
| A．to have come | B．to come |
| C．to be coming | D．to have been coming |